President Barack Obama's approval rating in the Buckeye State - one of the key bellwethers for national politics - dropped to 49 percent, the lowest of any swing state, according to a poll released Tuesday by Quinnipiac University in Hamden, Conn.Obama, who lost Ohio's Democratic primary to Hillary Rodham Clinton but topped Republican John McCain in November's general election, earned a 62 percent approval rating in the university's May survey.Statewide Democratic officeholders also saw their approval ratings shrink.U.S. Sen. Sherrod Brown's dropped 11 percentage points to 41 percent since the May survey; Lt. Gov. Lee Fisher's shrank 10 points to 39 percent; Secretary of State Jennifer Brunner's slid 7 points to 38 percent. The poll did not ask voters about Gov. Ted Strickland, whose approval rating slid 11 percentage points in a poll published last month (continues...)